@bilig/xlsx provides ZIP, address, and source-preserving patch primitives used by Bilig runtime packages. This package does not depend on SheetJS or the xlsx CDN tarball.

Source-Preserving Literal Patches

Use exportXlsxSourceLiteralPatchesToFileAsync when a service needs to apply scalar cell edits to an existing XLSX package while preserving untouched package parts and avoiding full-source reads:

import { exportXlsxSourceLiteralPatchesToFileAsync } from '@bilig/xlsx'

await exportXlsxSourceLiteralPatchesToFileAsync({
  source: fileBackedXlsxReader,
  outputPath: './patched.xlsx',
  sheetNames: ['Inputs'],
  patches: [{ sheetName: 'Inputs', address: 'B3', value: 96000 }],
})

The file-backed source only needs byteLength and readRange(start, end) for the streaming patch path. readBytes() is a fallback, not the normal path.